# Hyeongshin Yoon

> Software Engineer at SK hynix America | DRAM RAS & Data-Driven Reliability | KAIST

Location: San Jose, California, United States
Profile: https://flows.cv/hyeongshin

Hi! I’m a Software Engineer with over 5 years of experience, currently at SK hynix America in San Jose. My work sits at the intersection of Software, Data, and Hardware, with a focus on making memory systems more reliable (RAS).

Most of my day is spent building data platforms to process massive telemetry logs and analyzing that data to extract insights for our global customers. I also focus on developing better RAS features for DDRx and HBMx technologies.

I’ve always enjoyed solving difficult technical puzzles—whether it's cracking a complex algorithm or diving into memory faults for my research. I’m at my best when tackling challenges that require both persistence and a deep understanding of how the system works.

Always happy to connect and chat about the future of memory reliability. Welcome to the coffee chat! ✨

## Work Experience
### Software Engineer @ SK hynix America
Jan 2024 – Present | San Jose, California, United States
- Analyzed and extracted actionable insights from DRAM errors across DDR4, DDR5, and HBM technologies.
- Implemented updated criteria in the DRAM fault management system.
- Developed data pipeline for the DRAM fault management system.

### Software Engineer @ 위대한상상(요기요)
Jan 2022 – Jan 2024 | Seoul, South Korea
- Designed and implemented system architecture for synchronizing POS (Point of Sale) device status
- Implemented key features for both the API server and asynchronous worker systems
- Designed data structures to manage individual experiments and streamline workflow
- Developed a scheduling algorithm to optimize the switch-back testing method
- Built and maintained a back-office admin system to support operational efficiency
- Managed and resolved action items related to incidents, ensuring timely follow-up and resolution

### Software Engineer @ Grinder
Jan 2020 – Jan 2022 | Daejeon, South Korea
- Designed and implemented data structures to efficiently manage experimental workflows.
- Developed and deployed a gRPC microservice and admin interface to support A/B testing in a production environment.
- Built and maintained an analysis dashboard, conducting service analysis to help strategic business decisions.
- Engineered structured logging systems for comprehensive user behavior analysis.
- Simulated Multi-Armed Bandit (MAB) algorithms to optimize click-through rates (CTR).
- Developed an Image Classification model to identify inappropriate review images.

### Software Engineer Intern @ Google
Jan 2018 – Jan 2018 | Korea
- Improved media search result pipeline by integrating pipelines for desktop and mobile search results.


## Education
### Bachelor's degree in Computer Science
Korea Advanced Institute of Science and Technology


## Contact & Social
- LinkedIn: https://linkedin.com/in/hyeongshin-yoon
- Portfolio: https://hyeongshin.notion.site/

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Source: https://flows.cv/hyeongshin
JSON Resume: https://flows.cv/hyeongshin/resume.json
Last updated: 2026-04-11